WG C4.44 EMC for Large Photovoltaic Systems

Background :

At a global scale solar photovoltaic (PV) systems have shown in the last two decades a consistent exponential growth. Some forecasts give a total worldwide PV installed capacity of 500 GW by 2020, practically doubling the present (2016) capacity. Since PV is becoming such an important energy source, related considerations of electromagnetic compatibility (EMC) also become relevant, especially for large systems, i.e. grid-connected PV systems that are installed by energy generating companies. Due to the presence of sub-systems (cells, wires and the inverter) PV systems form a special EMI/EMC environment. The inverter is often a major source of conductive interference being able to inject disturbances into the power grid. In addition long cables can act as antennas thus radiated interference is also typical in these systems. Some efforts have been made to mitigate these issues. The EU directive and a few standards for solar PV exist, such as IEC 62305, while integration into the grid has caused several other standards to be considered and cross referred (e.g. IEC 62561, CLC 50539). However, measurement surveys show non-compliance issues which suggests that further study is needed in this area. Moreover, recent security concerns raise the possibility of intentional high power intentional electromagnetic interference (IEMI) and high electromagnetic pulse (HEMP) attacks which, again, could come through coupling to the PV wiring. During the last meeting of the WG C4.30 members agreed that as a natural follow up of activities related to EMC for wind energy systems, a group should be formed to address EMC for PV systems and produce a comprehensive technical brochure on this topic.

Scope :

  1. To produce a Technical Brochure on EMC for photovoltaic systems, focusing on large PV plants connected to the grid. Modelling aspects will be included to characterize EMC issues.
  2. To consider requirements due to high frequency conductive emissions from inverters affecting PV systems and the power networks.
  3. To consider radiated emission requirements from the PV wiring system.
  4. To consider immunity requirements for electronics in the vicinity of high EM fields caused by lightning.
  5. To consider immunity requirements for the PV control and electronics as a result of radiofrequency transmitters or mobile communication antennas operating in the vicinity.
  6. To consider immunity requirements for PV systems against IEMI and HEMP attacks.

Convener:Ener Salinas (Sweden)